https://techcrunch.com/2017/07/25/hungarian-hacker-arrested-for-pressing-f12/

The Budapest Transport Authority (BKK, in Hungarian) recently launched an online payment system with the help of a T-Systems Hungary, Deutsche Telekom’s consulting arm. The system, which took three months to build, was supposed to be installed in time for the FINA world championships in Budapest. The software, not unexpectedly for such a project, was full of bugs including the discovery of an administration screen with with a password set to “adminadmin.”